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18 Quick Reference
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To Call an XML Web service from your workflow Do This Use the InvokeWebService activity. Although you can use a Code activity with a Web reference and proxy, using InvokeWebService brings the invocation into the workflow designer instead of hiding it within a Code activity. You also can bind properties to the activity, which is handy. Provide an event handler for the Invoking event, and access the InvokeWebServiceEventArgs WebServiceProxy property (cast to your proxy type) to gain access to any of the typical proxy properties. Provide the same SessionId value to each instance of InvokeWebService. The session cookie can then be used to connect the method calls together within a single session.
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Dynamically reconfigure your proxy prior to making the XML Web service invocation
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Tie separate InvokeWebService calls to a single session
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19
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Workflows as Web Services
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After completing this chapter, you will be able to:
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Understand how the various workflow activities designed to expose your workflow as an XML Web service are used Understand what is required to host workflow in ASP.NET See how faults are handled in XML Web service based workfow Configure your XML Web service based workflow for various conditions
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In the previous chapter, Invoking Web Services from Within Your Workflows, you saw how to call XML Web services from your client-side workflow using the InvokeWebService activity that Windows Workflow Foundation (WF) provides for this purpose. The XML Web service in that chapter s sample application, however, was a typical ASP.NET XML Web service nothing special. In this final chapter, you ll learn how to take workflow processes and automatically expose the workflow as an XML Web service for clients to consume. It s not as simple as creating a workflow assembly library and referencing that from a Web service project, but then again, it s not difficult to do once you understand some essential concepts and see it accomplished in a sample application. Note
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This chapter focuses on integrating WF into ASP.NET for use as an XML Web service. But there are many critical issues you should be aware of when exposing XML Web services, not the least of which is security. A full discussion of security is well beyond what I can present here, but this link should get you started: http://msdn.microsoft.com/library/ default.asp url=/library/en-us/dnnetsec/html/THCMCh12.asp. If you re going to expose your workflow as an XML Web service, I strongly encourage you to review ASP.NET security best practices, especially practices that are centered around XML Web services.
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Exposing a Workflow as an XML Web Service
Part of the reason you can t directly execute the workflows you ve seen throughout the book in an ASP.NET environment is that the workflow runtime, by default, executes workflow instances asynchronously. In fact, that s a particularly valuable feature when working with workflow in non-Web applications. But in a Web-based scenario, this presents a problem. If an ASP.NET request comes in, whether it s for an XML Web service or even an ASP.NET Web page, the workflow instance
Part IV
External Data Communication
begins execution and the runtime returns control to ASP.NET. Your XML Web service or ASP.NET page immediately continues preparing output and likely finishes before the workflow instance completes. Because the workflow instance is asynchronous, executing in parallel with your ASP.NET application, your ASP.NET code could easily finish and return a response to the caller without ever completing the workflow processing. Tip Properly executing workflow instances within ASP.NET Web pages really calls for ASP.NET asynchronous Web pages, the discussion of which is beyond the scope of this book. However, this link gives you some details: http://msdn.microsoft.com/msdnmag/issues/05/10/ WickedCode/. This behavior presents at least two challenges for us. First, we need to disable, or at least work around, the asynchronous execution of our workflows. We need for them to execute synchronously such that they use the same thread our page or XML Web service is using so that the Web application doesn t return a response to the caller until we re finished. Of course, this leaves open the question of long-running workflows, which is the second challenge we ll need to address. The challenge long-running workflows present is centered around the nature of Web-based applications themselves. From the last chapter, you know that Web applications are by nature stateless. Requests made milliseconds apart are completely unaware of each other unless we build a framework to provide that awareness. Web applications also execute on Web servers, which are normally very expensive systems designed to serve a great many clients. If a workflow takes a long time to complete, it ties up the Web server and reduces the application s scalability (the ability to serve a greater number of client requests). The solution to both state management and long-running workflows is persistence. If your workflow process completes over the span of more than one Web-based invocation (ASP.NET page request or XML Web service), you must persist the workflow instance and reload it during the next execution cycle. This is also the reason why I mentioned regenerating the session-state cookie in the previous chapter s Long-Running XML Web Services section, because the client must also be aware of this possibility and make allowances for more than a single request-response. Internet Information Services (IIS) in particular, however, is quite adept at conserving system resources. In a typical client application, and in fact in every application you ve seen in the book so far, the workflow runtime is started when the application begins execution and runs throughout the lifetime of the application. IIS, though, recycles applications to reclaim server resources. This means two things to us as ASP.NET programmers. First, we have to somehow decide where and how to start the workflow runtime. Different requests for the same ASP.NET application are processed on different threads, but they
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